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Diffstat (limited to 'src/renderer/tr_image_jpg.c')
| -rw-r--r-- | src/renderer/tr_image_jpg.c | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/src/renderer/tr_image_jpg.c b/src/renderer/tr_image_jpg.c new file mode 100644 index 0000000..7390e14 --- /dev/null +++ b/src/renderer/tr_image_jpg.c @@ -0,0 +1,438 @@ +/* +=========================================================================== +Copyright (C) 1999-2005 Id Software, Inc. +Copyright (C) 2000-2009 Darklegion Development + +This file is part of Tremulous. + +Tremulous is free software; you can redistribute it +and/or modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the License, +or (at your option) any later version. + +Tremulous is distributed in the hope that it will be +useful, but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with Tremulous; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +=========================================================================== +*/ + +#include "tr_local.h" + +/* + * Include file for users of JPEG library. + * You will need to have included system headers that define at least + * the typedefs FILE and size_t before you can include jpeglib.h. + * (stdio.h is sufficient on ANSI-conforming systems.) + * You may also wish to include "jerror.h". + */ + +#ifdef USE_INTERNAL_JPEG +# define JPEG_INTERNALS +#endif + +#include <jpeglib.h> + +#ifndef USE_INTERNAL_JPEG +# if JPEG_LIB_VERSION < 80 +# error Need system libjpeg >= 80 +# endif +#endif + +static void R_JPGErrorExit(j_common_ptr cinfo) +{ + char buffer[JMSG_LENGTH_MAX]; + + (*cinfo->err->format_message) (cinfo, buffer); + + /* Let the memory manager delete any temp files before we die */ + jpeg_destroy(cinfo); + + ri.Error(ERR_FATAL, "%s\n", buffer); +} + +static void R_JPGOutputMessage(j_common_ptr cinfo) +{ + char buffer[JMSG_LENGTH_MAX]; + + /* Create the message */ + (*cinfo->err->format_message) (cinfo, buffer); + + /* Send it to stderr, adding a newline */ + ri.Printf(PRINT_ALL, "%s\n", buffer); +} + +void R_LoadJPG(const char *filename, unsigned char **pic, int *width, int *height) +{ + /* This struct contains the JPEG decompression parameters and pointers to + * working space (which is allocated as needed by the JPEG library). + */ + struct jpeg_decompress_struct cinfo = {NULL}; + /* We use our private extension JPEG error handler. + * Note that this struct must live as long as the main JPEG parameter + * struct, to avoid dangling-pointer problems. + */ + /* This struct represents a JPEG error handler. It is declared separately + * because applications often want to supply a specialized error handler + * (see the second half of this file for an example). But here we just + * take the easy way out and use the standard error handler, which will + * print a message on stderr and call exit() if compression fails. + * Note that this struct must live as long as the main JPEG parameter + * struct, to avoid dangling-pointer problems. + */ + struct jpeg_error_mgr jerr; + /* More stuff */ + JSAMPARRAY buffer; /* Output row buffer */ + unsigned int row_stride; /* physical row width in output buffer */ + unsigned int pixelcount, memcount; + unsigned int sindex, dindex; + byte *out; + int len; + union { + byte *b; + void *v; + } fbuffer; + byte *buf; + + /* In this example we want to open the input file before doing anything else, + * so that the setjmp() error recovery below can assume the file is open. + * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that + * requires it in order to read binary files. + */ + + len = ri.FS_ReadFile ( ( char * ) filename, &fbuffer.v); + if (!fbuffer.b || len < 0) { + return; + } + + /* Step 1: allocate and initialize JPEG decompression object */ + + /* We have to set up the error handler first, in case the initialization + * step fails. (Unlikely, but it could happen if you are out of memory.) + * This routine fills in the contents of struct jerr, and returns jerr's + * address which we place into the link field in cinfo. + */ + cinfo.err = jpeg_std_error(&jerr); + cinfo.err->error_exit = R_JPGErrorExit; + cinfo.err->output_message = R_JPGOutputMessage; + + /* Now we can initialize the JPEG decompression object. */ + jpeg_create_decompress(&cinfo); + + /* Step 2: specify data source (eg, a file) */ + + jpeg_mem_src(&cinfo, fbuffer.b, len); + + /* Step 3: read file parameters with jpeg_read_header() */ + + (void) jpeg_read_header(&cinfo, TRUE); + /* We can ignore the return value from jpeg_read_header since + * (a) suspension is not possible with the stdio data source, and + * (b) we passed TRUE to reject a tables-only JPEG file as an error. + * See libjpeg.doc for more info. + */ + + /* Step 4: set parameters for decompression */ + + /* + * Make sure it always converts images to RGB color space. This will + * automatically convert 8-bit greyscale images to RGB as well. + */ + cinfo.out_color_space = JCS_RGB; + + /* Step 5: Start decompressor */ + + (void) jpeg_start_decompress(&cinfo); + /* We can ignore the return value since suspension is not possible + * with the stdio data source. + */ + + /* We may need to do some setup of our own at this point before reading + * the data. After jpeg_start_decompress() we have the correct scaled + * output image dimensions available, as well as the output colormap + * if we asked for color quantization. + * In this example, we need to make an output work buffer of the right size. + */ + /* JSAMPLEs per row in output buffer */ + + pixelcount = cinfo.output_width * cinfo.output_height; + + if(!cinfo.output_width || !cinfo.output_height + || ((pixelcount * 4) / cinfo.output_width) / 4 != cinfo.output_height + || pixelcount > 0x1FFFFFFF || cinfo.output_components != 3 + ) + { + // Free the memory to make sure we don't leak memory + ri.FS_FreeFile (fbuffer.v); + jpeg_destroy_decompress(&cinfo); + + ri.Error(ERR_DROP, "LoadJPG: %s has an invalid image format: %dx%d*4=%d, components: %d\n", filename, + cinfo.output_width, cinfo.output_height, pixelcount * 4, cinfo.output_components); + } + + memcount = pixelcount * 4; + row_stride = cinfo.output_width * cinfo.output_components; + + out = ri.Malloc(memcount); + + *width = cinfo.output_width; + *height = cinfo.output_height; + + /* Step 6: while (scan lines remain to be read) */ + /* jpeg_read_scanlines(...); */ + + /* Here we use the library's state variable cinfo.output_scanline as the + * loop counter, so that we don't have to keep track ourselves. + */ + while (cinfo.output_scanline < cinfo.output_height) { + /* jpeg_read_scanlines expects an array of pointers to scanlines. + * Here the array is only one element long, but you could ask for + * more than one scanline at a time if that's more convenient. + */ + buf = ((out+(row_stride*cinfo.output_scanline))); + buffer = &buf; + (void) jpeg_read_scanlines(&cinfo, buffer, 1); + } + + buf = out; + + // Expand from RGB to RGBA + sindex = pixelcount * cinfo.output_components; + dindex = memcount; + + do + { + buf[--dindex] = 255; + buf[--dindex] = buf[--sindex]; + buf[--dindex] = buf[--sindex]; + buf[--dindex] = buf[--sindex]; + } while(sindex); + + *pic = out; + + /* Step 7: Finish decompression */ + + jpeg_finish_decompress(&cinfo); + /* We can ignore the return value since suspension is not possible + * with the stdio data source. + */ + + /* Step 8: Release JPEG decompression object */ + + /* This is an important step since it will release a good deal of memory. */ + jpeg_destroy_decompress(&cinfo); + + /* After finish_decompress, we can close the input file. + * Here we postpone it until after no more JPEG errors are possible, + * so as to simplify the setjmp error logic above. (Actually, I don't + * think that jpeg_destroy can do an error exit, but why assume anything...) + */ + ri.FS_FreeFile (fbuffer.v); + + /* At this point you may want to check to see whether any corrupt-data + * warnings occurred (test whether jerr.pub.num_warnings is nonzero). + */ + + /* And we're done! */ +} + + +/* Expanded data destination object for stdio output */ + +typedef struct { + struct jpeg_destination_mgr pub; /* public fields */ + + byte* outfile; /* target stream */ + int size; +} my_destination_mgr; + +typedef my_destination_mgr * my_dest_ptr; + + +/* + * Initialize destination --- called by jpeg_start_compress + * before any data is actually written. + */ + +static void +init_destination (j_compress_ptr cinfo) +{ + my_dest_ptr dest = (my_dest_ptr) cinfo->dest; + + dest->pub.next_output_byte = dest->outfile; + dest->pub.free_in_buffer = dest->size; +} + + +/* + * Empty the output buffer --- called whenever buffer fills up. + * + * In typical applications, this should write the entire output buffer + * (ignoring the current state of next_output_byte & free_in_buffer), + * reset the pointer & count to the start of the buffer, and return TRUE + * indicating that the buffer has been dumped. + * + * In applications that need to be able to suspend compression due to output + * overrun, a FALSE return indicates that the buffer cannot be emptied now. + * In this situation, the compressor will return to its caller (possibly with + * an indication that it has not accepted all the supplied scanlines). The + * application should resume compression after it has made more room in the + * output buffer. Note that there are substantial restrictions on the use of + * suspension --- see the documentation. + * + * When suspending, the compressor will back up to a convenient restart point + * (typically the start of the current MCU). next_output_byte & free_in_buffer + * indicate where the restart point will be if the current call returns FALSE. + * Data beyond this point will be regenerated after resumption, so do not + * write it out when emptying the buffer externally. + */ + +static boolean +empty_output_buffer (j_compress_ptr cinfo) +{ + my_dest_ptr dest = (my_dest_ptr) cinfo->dest; + + jpeg_destroy_compress(cinfo); + + // Make crash fatal or we would probably leak memory. + ri.Error(ERR_FATAL, "Output buffer for encoded JPEG image has insufficient size of %d bytes\n", + dest->size); + + return FALSE; +} + +/* + * Terminate destination --- called by jpeg_finish_compress + * after all data has been written. Usually needs to flush buffer. + * + * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding + * application must deal with any cleanup that should happen even + * for error exit. + */ + +static void term_destination(j_compress_ptr cinfo) +{ +} + + +/* + * Prepare for output to a stdio stream. + * The caller must have already opened the stream, and is responsible + * for closing it after finishing compression. + */ + +static void +jpegDest (j_compress_ptr cinfo, byte* outfile, int size) +{ + my_dest_ptr dest; + + /* The destination object is made permanent so that multiple JPEG images + * can be written to the same file without re-executing jpeg_stdio_dest. + * This makes it dangerous to use this manager and a different destination + * manager serially with the same JPEG object, because their private object + * sizes may be different. Caveat programmer. + */ + if (cinfo->dest == NULL) { /* first time for this JPEG object? */ + cinfo->dest = (struct jpeg_destination_mgr *) + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, + sizeof(my_destination_mgr)); + } + + dest = (my_dest_ptr) cinfo->dest; + dest->pub.init_destination = init_destination; + dest->pub.empty_output_buffer = empty_output_buffer; + dest->pub.term_destination = term_destination; + dest->outfile = outfile; + dest->size = size; +} + +/* +================= +SaveJPGToBuffer + +Encodes JPEG from image in image_buffer and writes to buffer. +Expects RGB input data +================= +*/ +size_t RE_SaveJPGToBuffer(byte *buffer, size_t bufSize, int quality, + int image_width, int image_height, byte *image_buffer, int padding) +{ + struct jpeg_compress_struct cinfo; + struct jpeg_error_mgr jerr; + JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */ + my_dest_ptr dest; + int row_stride; /* physical row width in image buffer */ + size_t outcount; + + /* Step 1: allocate and initialize JPEG compression object */ + cinfo.err = jpeg_std_error(&jerr); + cinfo.err->error_exit = R_JPGErrorExit; + cinfo.err->output_message = R_JPGOutputMessage; + + /* Now we can initialize the JPEG compression object. */ + jpeg_create_compress(&cinfo); + + /* Step 2: specify data destination (eg, a file) */ + /* Note: steps 2 and 3 can be done in either order. */ + jpegDest(&cinfo, buffer, bufSize); + + /* Step 3: set parameters for compression */ + cinfo.image_width = image_width; /* image width and height, in pixels */ + cinfo.image_height = image_height; + cinfo.input_components = 3; /* # of color components per pixel */ + cinfo.in_color_space = JCS_RGB; /* colorspace of input image */ + + jpeg_set_defaults(&cinfo); + jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */); + /* If quality is set high, disable chroma subsampling */ + if (quality >= 85) { + cinfo.comp_info[0].h_samp_factor = 1; + cinfo.comp_info[0].v_samp_factor = 1; + } + + /* Step 4: Start compressor */ + jpeg_start_compress(&cinfo, TRUE); + + /* Step 5: while (scan lines remain to be written) */ + /* jpeg_write_scanlines(...); */ + row_stride = image_width * cinfo.input_components + padding; /* JSAMPLEs per row in image_buffer */ + + while (cinfo.next_scanline < cinfo.image_height) { + /* jpeg_write_scanlines expects an array of pointers to scanlines. + * Here the array is only one element long, but you could pass + * more than one scanline at a time if that's more convenient. + */ + row_pointer[0] = &image_buffer[((cinfo.image_height-1)*row_stride)-cinfo.next_scanline * row_stride]; + (void) jpeg_write_scanlines(&cinfo, row_pointer, 1); + } + + /* Step 6: Finish compression */ + jpeg_finish_compress(&cinfo); + + dest = (my_dest_ptr) cinfo.dest; + outcount = dest->size - dest->pub.free_in_buffer; + + /* Step 7: release JPEG compression object */ + jpeg_destroy_compress(&cinfo); + + /* And we're done! */ + return outcount; +} + +void RE_SaveJPG(char * filename, int quality, int image_width, int image_height, byte *image_buffer, int padding) +{ + byte *out; + size_t bufSize; + + bufSize = image_width * image_height * 3; + out = ri.Hunk_AllocateTempMemory(bufSize); + + bufSize = RE_SaveJPGToBuffer(out, bufSize, quality, image_width, image_height, image_buffer, padding); + ri.FS_WriteFile(filename, out, bufSize); + + ri.Hunk_FreeTempMemory(out); +} |